Ckp Sensor Troubleshooting - Honda BF135A Manual

BF135A•BF150A
5. MAP sensor ground line open circuit check
-1. Check for the continuity between the No. 1 (Green/
Red) terminal of the MAP sensor harness side 3P con-
nector and the body ground.
MAP SENSOR HARNESS
SIDE 3P CONNECTOR
SG1 (GREEN/RED)
VIEWED FROM THE TERMINAL SIDE
Is there the continuity?
YES – Perform "6. MAP sensor check".
NO – Repair open in the wire between the MAP
sensor and the ECM.
6. MAP sensor check
-1. Connect the MAP sensor 3P connector.
-2. Turn the ignition switch ON. Measure the voltage
between the test harness B-5 terminal (+) and the B-6
terminal (–).
B-5
Is the measurement 2.76 – 2.96V?
YES – Substitute a known-good ECM and recheck.
NO – Replace the MAP sensor.
B-6

• CKP Sensor Troubleshooting

MIL blinks 4 times.
1. Symptom reproduction test
-1. Reset the ECM.
-2. Start the engine and let it run at idling under no load.
-3. Check the MIL.
Does the MIL come ON?
YES – Perform "2. CKP sensor power supply line
open circuit check".
NO – Temporary failure (Disappeared)
2. CKP sensor power supply line open circuit check
-1. Turn the ignition switch OFF and disconnect the CKP
sensor 3P connector.
-2. Turn the ignition switch ON and measure the voltage
between the No. 1 (Yellow/Black) terminal of the CKP
sensor harness side 3P connector and the engine
ground.
CKP SENSOR HARNESS
SIDE 3P CONNECTOR
IGP
(YELLOW/BLACK)
VIEWED FROM THE TERMINAL SIDE
Is there the battery voltage?
YES – Perform "3. CKP sensor signal line open cir-
cuit check".
NO – Repair open in the wire between the ECM
and CKP sensor.
3. CKP sensor signal line open circuit check
-1. Turn the ignition switch ON. Measure the voltage
between the No. 3 (Blue) terminal of the CKP sensor
harness side 3P connector and the engine ground.
CKP SENSOR HARNESS
SIDE 3P CONNECTOR
VIEWED FROM THE TERMINAL SIDE
CRK (BLUE)
5-72